5-Card Draw 7-A is essentially 5-Card Draw with a stripped deck. The 2,3,4,5 and 6 have been removed from the deck. Each player gets one draw, and they can draw as many cards as they wish. The object is to make the best possible poker hand, using the standard ranking, except Flushes rank ahead of Full Houses. The hand A-7-8-9-T counts as a possible straight, as well as the more conventially alternatives.
The only place to play 5-Card Draw 7-A online is at Poker Heaven:
